scsi: mvsas: make mvst_host_attrs static

Fix the following sparse warning:

drivers/scsi/mvsas/mv_init.c:28:25: warning: symbol 'mvst_host_attrs' was
not declared. Should it be static?

Link: https://lore.kernel.org/r/20200415085044.7460-1-yanaijie@huawei.comReported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Jason Yan <yanaijie@huawei.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/mvsas/mv_init.c

@@ -25,7 +25,7 @@ static const struct mvs_chip_info mvs_chips[] = {
 	[chip_1320] =	{ 2, 4, 0x800, 17, 64, 8,  9, &mvs_94xx_dispatch, },
 };
 
-struct device_attribute *mvst_host_attrs[];
+static struct device_attribute *mvst_host_attrs[];
 
 #define SOC_SAS_NUM 2
 
@@ -785,7 +785,7 @@ static void __exit mvs_exit(void)
 	sas_release_transport(mvs_stt);
 }
 
-struct device_attribute *mvst_host_attrs[] = {
+static struct device_attribute *mvst_host_attrs[] = {
 	&dev_attr_driver_version,
 	&dev_attr_interrupt_coalescing,
 	NULL,